The top chord of a roof truss is inclined at an angle of 20°, no access is provided for maintenance. The live load to be considered for the design will be
Concept:
Load On Roof Truss:
Roof trusses are subjected to dead load, live load, Snow load, and wind load.
According to IS Code: 875 Specify the following live loads to be assumed in the analysis of an industrial building
Roof slope |
Access |
Live load |
<10 |
Provided |
1.5 kN/m^{2} |
>10 |
Not Provided |
0.75kN/m^{2} of the plan area |
According to the design considerations,
The unit weight of the roofing material is prescribed as:
live load = 0.75 -10 x 0.02 = 0.55 KN/m^{2}
For roof membrane sheets or purlins, 0.75KN/m^{2} less 0.01 KN/m^{2} for every degree increase in slope up to and including 20 degrees and 0.02 KN/m2 for every degree
Increase in slope over 20 degree
Now check:
< 0.4 KN/m^{2} ,Hence safe
Additional Information
Snow loads:
Wind loads: